Vulkan: Use DEVICE_ONLY VkEvent when available VK_KHR_synchronization2 adds device only event. Since we are not using host operations on the event, this CL adds VK_EVENT_CREATE_DEVICE_ONLY_BIT_KHR bit when create VkEvent for RefCountedEvent. Bug: b/336844257 Change-Id: I0528b7f45b0da162daa228aea2adf5ce06b5fd6b Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5503644 Reviewed-by: Amirali Abdolrashidi <abdolrashidi@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Charlie Lao <cclao@google.com>